/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.mapred;

/**
 * TaskStateChangeListener is invoked by the CoronaJobInProgress when
 * task status changes: task completion, task failure, etc.
 *
 * Things like handling the resources of the task can be handled here
 */
public interface TaskStateChangeListener {
  /**
   * This method is called when the task state changes
   *
   * @param state the new state of the task
   * @param tip the task
   * @param taskid the attempt that changed the state of the task
   * @param host the host where the task ran.
   */
  void taskStateChange(TaskStatus.State state, TaskInProgress tip,
      TaskAttemptID taskid, String host);
}
